How to: Trail Boss Mikuni Carburetor Carb Cleaning Main Jet Pilot Jet Choke Air Fuel Adjustment

Рет қаралды 93,127

6 жыл бұрын

A quick video cleaning a carb from a 1991 Polaris Trail Boss 250 4x4. Many Mikuni carbs function in a similar fashion around this time frame even the 300 350 400 425 500 Polaris atvs and four wheelers from this time era.

Пікірлер: 47

@GatorBuilt11 3 жыл бұрын

One of the best carb videos I have seen on youtube

@mikerisher1536 5 жыл бұрын

Thank you for the detailed video. Very helpful

@brandonmagnan464 Жыл бұрын

Perfect watch while sitting on the toilet

@joshskyeroberts6502 9 ай бұрын

Great video brother.!!!!

@ejr4140 2 жыл бұрын

great video ! thanks bro

@alexyoung3046 Жыл бұрын

Great video thanks for the help

@brianmoore3659 3 жыл бұрын

Good video!!

@alfredparise 6 жыл бұрын

I'm having trouble too with 92 Polaris 350L, it would run really rough and shut off when using the throttle.I open the airbox and found mice had been living in there. I will take off carburetor and clean it like you suggested Thanks

@BrapStuff 6 жыл бұрын

Sometimes mice get into the clutch cover as well. It may be a good idea to check that also.

@bryanfair5345 5 жыл бұрын

Awesome videos they are helping me replace the piston on a trail boss 350 I got it as a project and don’t know anything about it lol. Manage to get new piston in “top end rebuild kit”. Now I’m working on carb well since it was inside a bucket I don’t exactly know how to hook up the throttle slid peace. Could help me ?

@osbornebay944 2 жыл бұрын

Super, my carb behaves like you have to open quiet a lot for it stays idle, if l starve fuel supply, engine racing up. l felt it runs on chock fuel. l ll follow your instruction to do a good cleaning.

@jequinlan3 5 жыл бұрын

Anyone have info for vent tubing routing? Carb and tank?

@ds77chevyrules 4 жыл бұрын

Hey bud i just got the new piston and jug for my 1990 trail boss it has troubles starting when your turning it over it will fire up halfass but wont stay running need help

@austineverett6384 2 жыл бұрын

Awesome video but o didn’t catch where you adjusted the carb at all

@BallisticVolts 6 жыл бұрын

im having trouble with my 96 polaris explorer starting slow and always dying after the first start then taking forever to start again. eventually when it does start it runs great but recently its been dying at full open throttle. any advice? it has pretty low compression but im not convinced thats the only problem.

@BrapStuff 6 жыл бұрын

It's sounds as if there are multiple issues going on. If on cold starts using choke it starts then dies and is hard to start again that sounds to me that it's getting too rich and flooding out. I would try starting with choke, with out, and by squirting gas directly in the carb. See how that affects the start. As for wide open throttle having it die, I have seen plugged petcocks starve the carb. You may want to pull the fuel line and check the flow on and res from the petcock.

@BallisticVolts 6 жыл бұрын

Brap Stuff I thought it was flooding too but not experienced enough to know. Thank you so much for the help!

@davidjones6092 4 жыл бұрын

I have an 03 trailblazer with a similar carb. I just went through everything and cleaned it good, put it back together and it won’t start without adding gas straight into the carb. Once I get it started I have to keep it at high rpms to keep it running but as soon as I let off it dies out and won’t start again. Do you have any ideas?

@shawnr9357 4 жыл бұрын

Did you get it figured out??? Mine is doing the exact same thing?

@coreyrides9650 4 жыл бұрын

@@shawnr9357 the bowl probably isn't filling tap the bottom of the carb and blow into the gas tank

@truthseek3017 4 жыл бұрын

@@shawnr9357 turn the bronze air screw to the left or the big idle screw to the right.

@easydoz1 4 жыл бұрын

Make sure your not losing spark at no throttle. They have a switch in handle bar throttle box. If throttle cable breaks it kills the engine

@jasontrevino2065 2 жыл бұрын

how do you remove choke cable from carb? i’m having trouble taking off. thanks

@JohnDoe-pv2iu Жыл бұрын

It came off easiest for me with two tiny wrenches. The big nut seemed stuck until the little one was loose. That isn't how it works though. I was just not getting a good grip on the big one and think breaking the little one loose helped loosen the big one...

@nunyabidness6973 3 жыл бұрын

What is the big jet with spring on it by the air fuel mixture???

@ljohnson1008 3 жыл бұрын

Idle

@nathandegarmo4288 4 жыл бұрын

I got a 92 trail boss it starts and runs then after 10min it bogs down and won't fire back up till it cools down any ideas

@BrapStuff 4 жыл бұрын

Low compression, wrong fuel/oil mixture, fuel filter or petcock half plugged.

@nathandegarmo4288 4 жыл бұрын

Ok she runs great now and nowI have a loose chain and it keeps popping off the sprocket and I have no clue how to tighten it and to be honest I think I've bitten off more than I can chew but I'm slowly figuring it out lol

@lamarzimmermanmennonitefar5269 4 жыл бұрын

@@nathandegarmo4288 there's two bolts on the back of the axle to loosen, and you rotate the axle Barrel and tighten the bolts again

@williamtarr9758 4 жыл бұрын

How many turns out for the air fuel screw

@BrapStuff 4 жыл бұрын

Start with 2 turns about adjust half turns if needed.

@daltonray796 4 жыл бұрын

Brap Stuff I got a 1993 trailboss

@BrapStuff 4 жыл бұрын

@@daltonray796 Niiiiiiiiice braaaaaaaah!

@Chuckseese Жыл бұрын

You didn’t take out the main jet though

@trojanman22 5 жыл бұрын

do you know the model of this carb?! its exactly whats on my 2001 trailblazer and i dont think it should be....

@BrapStuff 5 жыл бұрын

I believe the part number for this carburetor is 3130424. It was used from 1991-1999 I believe. It would likely work on the trailblazer, but you may need to rejet for best performance.